import Image
import os

files = [x for x in os.listdir('.') if x.lower().endswith('.png')]
x = 341
y = 128
w = 546
h = 418
box = (x, y, x+w, y+h)

for f in files:
    print f
    im = Image.open(f)
    region = im.crop(box)
    region.save(f)
